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Structural studies of nanocrystalline ATO and ITO (CROSBI ID 532032)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Gržeta, Biserka ; Tkalčec, Emilija ; Popović, Jasminka ; Goebbert, Christian ; Takeda, Masuo ; Takahashi, Masashi ; Ksenofontov, Vadim Structural studies of nanocrystalline ATO and ITO // 39th Course of International School of Crystallography. Engineering of crystalline materials properties: state-of-the-art in modelling, design, applications. Lecture notes and poster abstracts / Addadi, Lia ; Braga, Dario ; Novoa, Juan (ur.). Erice: Ettore Majorana Foundation and Centre for Scientific Culture, 2007. str. 616-616-x

Podaci o odgovornosti

Gržeta, Biserka ; Tkalčec, Emilija ; Popović, Jasminka ; Goebbert, Christian ; Takeda, Masuo ; Takahashi, Masashi ; Ksenofontov, Vadim

engleski

Structural studies of nanocrystalline ATO and ITO

Nowadays many investigations in the fields of physics and chemistry are aimed towards a research of the properties of new materials, but also towards discovering of new techniques which can improve the properties of the well known materials and make them interesting for a modern technology. Doping of materials by selected atoms very often causes such improvements, but a mechanism of the doping process is not well understood in all cases. This work focuses on structure examination of antimony doped tin oxide (ATO) and tin doped indium oxide (ITO). Tin oxide (SnO_2) and indium oxide (In_2O_3) are transparent semiconductors. On the other hand, ATO and ITO are transparent conductors, which are widely used for various modern optoelectronic applications such as thin film transparent conductors in electroluminiscent devices, solar cells, etc. Powder ATO samples containing 3.1, 6.2, 11.9 and 14.0 at% Sb were prepared by a sol-gel technique followed by hydrothermal treatment at 250  C and 2.5 MPa. They were examined by X-ray diffraction (XRD) and 121Sb-Mössbauer spectroscopy. The samples were tetragonal, space group P42/mnm and isostructural with TiO2 (rutile). Unit-cell parameters increased with Sb content up to the doping level of ~12 at%, after which they decreased. Diffraction lines were broadened indicating nanosized particles in the samples. The line broadening was anisotropic. Both the line broadening and line anisotropy were dependent on the Sb doping level. The structure of samples was refined by the Rietveld method. Crystal structure indicated that both Sb^(3+) and Sb^(5+) are substituted for Sn^(4+) in the SnO_2 structure, Sb^(3+) being dominant for the investigated samples. Incorporation of Sb^(3+) caused an oxygen deficiency in the original SnO_2 structure, which could be a source of anisotropy in the XRD line widths. 121Sb-Mössbauer spectroscopy confirmed the XRD results. Powder ITO samples containing 2.1, 4.0, 6.0, 7.8, 9.7 11.1 and 12.3 at% Sn were prepared by a sol-gel technique followed by thermal treatment at 300 oC for 2 h. Structural studies of the samples was undertaken by means of XRD and 119Sn-Mössbauer spectroscopy. Diffraction patterns indicated that the samples were cubic, space group Ia3 and isostructural with In_2O_3. Diffraction lines were broadened, the line broadening increased with tin content. The unit-cell parameters increased with Sn doping level up to 7.8 at% Sn and decreased at higher levels. This indicated that Sn substitution for In on the B and D cation sites of the original In_2O_3 structure is non-uniform and depends on Sn doping level. Rietveld structure refinement proved the presence of interstitial oxygen in the ITO structure. The position of interstitial oxygen indicates on tin preference to occupy D site for low doping level, and subsequent change in D/B occupancy ratio in favour to B site with the increase in tin doping level. 119Sn-Mössbauer spectroscopy revealed that incorporated tin resided equally on the B and D sites for 7.8 at% Sn. Below that doping level the preference for tin to occupy D site was noticed, while for doping level higher than 7.8 at% Sn the B site was preferred.

Antimony doped tin oxide (ATO); Tin doped indium oxide (ITO); X-ray powder diffraction; Rietveld method; Crystal structure; Moessbauer spectroscopy

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Podaci o prilogu

616-616-x.

2007.

objavljeno

Podaci o matičnoj publikaciji

39th Course of International School of Crystallography. Engineering of crystalline materials properties: state-of-the-art in modelling, design, applications. Lecture notes and poster abstracts

Addadi, Lia ; Braga, Dario ; Novoa, Juan

Erice: Ettore Majorana Foundation and Centre for Scientific Culture

Podaci o skupu

39th Course of the International School of Crystallography. Engineering of crystalline materials properties: state-of-the-art in modelling, design, applications

poster

07.06.2007-17.06.2007

Erice, Italija

Povezanost rada

Fizika, Kemija